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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2ea4a42a0aaf13787424a0cd85c9092728271ee76e1ed721d4eadaec0b4e34' 
  AND token = 'sgFfvT9f4kkSh7IHmdYeeqDT3i1V3hVy+WreOHyV7aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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