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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e4d513aef6fcdfb42c81a2e09fa95a5d86edb265f83d404b7228e6572d20c5' 
  AND token = '6FpHKbru+diFkH8pS9OIlC4JO5n2tWROrwPKFc/ITms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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