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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac682c70a3675219d9d74c86772f79ccfafd7eff24e83c2ef6f6110137029cb5' 
  AND token = 'kJXfc95siwYpIWX0ZQAkMF8PY3+QayJopcwtG46yKFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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