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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6f123c3303d0fe9c0420860f5bb535e44b820963abe57309383eb9edccaebd' 
  AND token = 'f8n5/HhDEff9huwZspq6iyXmo+qYixOZ+u2t+c4mey4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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