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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738bbd6233dea748eb30885a7e8aa72a0d2e26b39a6a62fa62c894aa96149214' 
  AND token = 'VLk0bK3cCmEfdNDSSX4YZgsTb8iUasKkhhI9zMNzlm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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