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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8d2b82a6ad9fd046273d27e8eb69cd8b2439b79de26b03491ef7fc7818e923' 
  AND token = 'B+xgRC7wOcRJTN8dUmyCqVeas4IPOum1Bf8CXjFz03A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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