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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1789255adebcf1c0521d88add61d54b120393fe286935bf704c5215bd33fa8' 
  AND token = 'GH9+3jW6MNI0mq5TKbi53jGG8ENvxXNR5+kvCyrfc5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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