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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a35f78b718281af87d67a7e55e884346c68715471d2c000c080342353db13f2' 
  AND token = 'fMh+XXLiGx8NELI9+Ul5wMGjpx/0fGKLG9tNfvnEoW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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