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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdc5ea437e76e3a142f756d535a11f73e9d837560ce90e68bba4a0e305d1229' 
  AND token = 'j2Cu0cdIpGt8I3dAnb7Wc5/yLO1sm7sZI4Ma1ErVDd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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