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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef0f9370deb20d5e2f1d4c4f9b5467cd315696f059a337c8d5cfab74c0e61e1' 
  AND token = 'XpF2JXi2Lj7g9f24KvSpdkoJWVaccleybFMEcat3M3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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