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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2ff04e0a511894cb6b00b3c2e960c85729870550427557a1aa1544e47b4e8e' 
  AND token = 'DMP7QUCz0lR6Xg9ML4Uczpwj6dCp7rE81lEHvqstA0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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