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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc884bce02e8cb0d4a67832c6a8955c4905c8ee64ec70cfcbce7844b2ae015f' 
  AND token = 'Xeuug2TemJkm6/4mce2+EiN4d+sWMonH/vF8+cMlEPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}