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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df62bf4bab7c4386e288eaffabf279bcb26b98c84577be20d94df7af314e7d9' 
  AND token = 'd+C2NoncC+U0xKHF9zvow5v+tcqNVwtCuSlXdglbyOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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