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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b8e9f1d20770c8e2a622169ddbec07e244f8b5a0a21889fe36a661493cc506' 
  AND token = 'taBmP+ki8rZuQeG/CC1cmJJ8E6koFTjBrSUNcIHGj8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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