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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c47845b8917d8b0e3c539490272928aeb6ed830c8e644945d8f10c0c1e617f3' 
  AND token = 'pnra2fihrQ5APxPyUGf4JtOplidblUVm6dxksxAQPTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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