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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c046742f6f6808f55755eb5bdb2500f6b5a4119a6bce38cee3d943e47c9a83' 
  AND token = 'hf6OyYYHaQqqs9omuiXV6XDyIev4bD2elbz0PlJn128=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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