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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88b725754a87d2193f60be84a57ba3c79eb72e9e39d8ad961a315d777a0d3d8' 
  AND token = 'wOBxR9YRqzltpcFQ55etWR9gVP555R3j5jrJsgJkw7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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