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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3525ba43625b4ac43aedf804bd4583edfaf4892b0c2462e3aff7ab36d8552a16' 
  AND token = 'RZGzTEX8ubKCuF9eO9PrWCg3y+vPh7nm+0wE0JlEPa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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