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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0a95e2f482ec6b0255febfd94ff38d26cd17c72db9af46753d13570bc35ee1' 
  AND token = 'YHOi+yrZvJHVLkduXiA7UBk70idjPXdLi97opdygn0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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