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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c107881e72ef5459ab13710683a12122a7765d8b158f0b903428f547a110c5d' 
  AND token = '/298gjfxxZ+WVHWz9Jb152LrViyYHZtMeStLt87oP9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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