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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4571de1e80663a8949b9050b2b2dc929adc7303326a8a7120f79ab5b38c3bae' 
  AND token = 'rOHBF+Zo8G5090mwsfBzGM9PDn5t7udYDcj4TKys+a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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