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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713d41651c9d1ead41010858a8075b049ca956f78a54e273d0838ef71b9eb090' 
  AND token = 'TolU+49lWr4NVjaBBNgO4jONBiOOBgy7lRs+plgx6PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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