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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8d8e8b7bbb754e37089f4459980b526a69840cb52bb598cc9f318d0dd86cf4' 
  AND token = 'BZ9hSo8UemRHDfWb8B8hIzg4fshFaR9LiR4PMzHpsZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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