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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56696b70340e2f1574859e0538ba20af1c1b6b7fbf7cc16d92347d6929e0dd6f' 
  AND token = 'fM/ephPoomHZj/hW0Hi9kvQtUc75GujUx9VaIRPNwx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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