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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee79b3385a8de0b4bc3a75c2b15d5277a8b270bac4f4070a9f414de24bc9ba5' 
  AND token = 'XbGdKwxP5cJs2Jl2DCIbCIKaKmR7faDStDGEYOSqeLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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