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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c886b3b046ba8b34d4461e5cb94146022f4dea3fff71d5508b219c0266a6198d' 
  AND token = 'Ibe6CuBvA15WL93d997BIGZyrcftjS+iq39ez7KTUec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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