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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd03e08344d479b0533692f097c57018932ff5dd409cc9f8b5a3ed9f5ee03816' 
  AND token = 'fX1tdVca7ZbtEXSe0UvnGJtquSWlUjIAdfYNLOA8X1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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