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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe83aa2db7a14fc0b173f48159b1987691d8e1532e6fccceb36f504570f5e2f' 
  AND token = '07n1iGszTqWCyDk13qesrLxJObmpGYifWSdQfrtMClY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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