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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906430df9a687e19234c78bdb8193694ebc7acfb83b1b4b71eb4505cd7510766' 
  AND token = 'Tx2PCimhyaBLIWC9Ih7OQietEA4K0A6ZHMY+9y32dqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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