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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0331e57f89b7e069263e48640a0bd7d19ad82df0c093ee15d377625caabb8acc' 
  AND token = 'YPb/xhWTmdIq9satzSd8JTNWK1RcCV7RO04djSE+3LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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