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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba750eb2c24c3ecbfa4dc753dcb05cf62d5649492bf3485be71a84799db52c6' 
  AND token = '4p19os/15EOTKjS4gaa3ynD9ZEXP5Kqm+U99vIwdg9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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