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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5b98c5bdca2e7584eb91cb85f44811571bb4aae46e58d4f30f4fa1ee6ae54a' 
  AND token = 'aFRjreRf4C0Wz/baDUgbd4ZfxvULmhvZok3/WrRsFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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