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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2602afbdeca7829d2a22ef6a4f44cf1d62ec98361a8850bf3fdab7e7a9766d8a' 
  AND token = '8ouwr1ZIggCrIjdUddix8higvqHTzS2gnFaku6D0i30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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