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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed403d3ff360c1ce786d19474d43ac5965201df2ebb29099a411c8318f41f5d' 
  AND token = 'yEIZU0psapk7ocA8dOt/RQskyGaXtKZrg03VRzltzQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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