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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb8aee017b233b02e1488de0ac0fe0f31a26954d917cea89319dcc0e68c5715' 
  AND token = 'FCcI4/RF+chPLyu2Bj7RH4CExKec22FRaRbsyovz190=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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