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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f437b1b86045f2cee52d51b429143deeaf02c45d9c57858397a969d9b660e086' 
  AND token = 'd4gHpmdNJSv7XL9oVTn9om1xffu20M4NFJY2nl6YVdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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