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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19636cb919875dc8e65152f4b389482b262646a8821fb0207a0c68e832f6c38b' 
  AND token = 'RqJFibDe7B5Y+EBZe2BAPof2AsaKLboajiMBnF6kNPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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