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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea78083eb64ec26b444c812ce0c975cf8602d8a26942f43f6078858177c57aa' 
  AND token = 'ntcBLyj1JGrxF4wBYeUsuBvYM+Q/bDYcsoyq+YTE49Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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