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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa02d2e0c9e33e102ba47683fe2bf4575fceb1fd3f530b955d65d3ae54f1b43e' 
  AND token = 'oRs83zHsFsd0gmox4DpEzE6atkQZpUij4QhHIuevFv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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