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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a59ed314b0ab7dfbfe0f501784f80059a3b1b3325ed5205c64260038c9add6' 
  AND token = '7wdRAIo/2IBWtjPJoSsf8ySNX2IX17jNHcp6OJMvdO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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