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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2679ef9e98ce45768aaa51dd2359a7389d6e27ba5f11540205759ab5d727cf' 
  AND token = 'GqJXmoERnG2P54vH47xMU9Obl0RABuh/Qc4Xk6vdrts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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