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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c000be0a0feece0a46d77e42a78b00c5262df0e3020c9b487edbf14f9f2953ba' 
  AND token = 'sVksjQEr/nsILHrqHdihXz9Tmx9udRaB2cAnmlwbv/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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