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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013fb08108a62890af5dc94a15d26d3f2ee66aad3c5e443e0fe5b32e4b409948' 
  AND token = 'TdOkTOJD01hjE03CHLKb0VX5FHTJPrtWa9kBq0r9OGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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