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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f56872495780cc27d6c2af2fcc7589fc2755515af35751c1238c4d5a83266ec' 
  AND token = 'd7VZsahxnd3xTjdS1bdu/h1egHWJUoxDo3MIHWZmZ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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