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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0de748b93ec4db2e2da473156e2b88b77e9886fdbd9680a28456d99a904d6d0' 
  AND token = 'VHiSaeREFYrBBsDJtCTM+oh4oIYEXqCxZB/qSNvyjEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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